Cooling plate for metallurical furnaces

ABSTRACT

A cooling plate comprises a metallic plate proper provided with openings filled with a refractory material, and a cooling pipe embedded in said plate. The openings extend through the full thickness of the plate and horizontally so that the metallic plate has an S-shaped form. In a vertical plane said openings have the form of a trapezium, and the cooling pipe follows the configuration of the metallic plate.

FIELD OF THE INVENTION

The present invention relates to ferrous metallurgy, and particularly tocooling plates for metallurgical furnaces.

The invention may prove most advantageous in cooling metallurgicalfurnaces, and particularly blast furnaces.

DESCRIPTION OF THE PRIOR ART

Known in the art is a cooling plate for metallurgical furnaces (PolishPatent Specification No. 65,896), comprising a metallic plate properprovided with openings filled with a refractory material, and a coolingpipe built thereinto.

More specifically, the cooling plate comprises a metallic plate providedwith ribs or tie-plates disposed at a right angle to the surface thereofand forming blind openings or pockets, the metallic plate proper servingas a bottom portion thereof, while their open portions form a front sidefacing the furnace chamber. The openings are filled with firebricks.

During operation of the cooling plate of the above construction, thereoccur thermal stresses in the ribs of tie-plates forming blind openings,said stresses being caused by thermal expansion of the firebricks. Sincethe above tie-plates are disposed parallel to one another, during theoperation of the cooling plate of such a design, bricks crack and fallout, thereby resulting in the formation of a non-uniform thermal fieldin the body of the metallic plate proper, and in premature damagingthereof. In other words, the service life of such cooling plates islimited.

SUMMARY OF THE INVENTION

The invention resides in a cooling plate for metallurgical furnaces,wherein, due to equalizing the temperature (thermal) field through themetallic portion thereof, the rate of heat removal is increased andthermal stresses in the metallic portion of the plate are decreased,thereby increasing the service life of the cooling plate.

The object set forth is attained in a cooling plate for metallurgicalfurnaces, comprising a metallic plate proper provided with openingsfilled with a refractory material, and a cooling pipe built thereinto.According to the invention said openings extend horizontally through theplate thickness so that the metallic plate is S-shaped, said openingshaving the form of a trapezium in the vertical plane, and the coolingpipe follows the configuration of said metallic plate.

During the operation of such a cooling plate, due to the fact that inthe metallic plate proper the openings extend horizontally through theplate thickness so that the metallic plate is S-shaped, there is ensureduniform and intensive cooling of the metallic portion thereof. Since inthe vertical plane the openings have the form of a trapezium, if theplate is mounted so that the trapezium is directed with the smaller basethereof into the furnace chamber, openings are held therewithin evenafter the damage of the lining, the firebricks in said. Since thecooling pipe follows, the configuration of the metallic plate proper,during the operation of the inventive structure, the intensity of heatremoval in this metallic plate proper is increased, thermal stresses arereduced, wear resistance of the cooling plate is improved, andconsequently the service life thereof is prolonged.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is further explained in terms of a specific example of anembodiment thereof with reference to the accompanying drawings, inwhich:

FIG. 1 is a rear view of a cooling plate of the invention, and

FIG. 2 is a sectional view of a cooling plate of the invention along theline 2--2 in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

A cooling plate comprises a metallic plate 1 proper having, for mountingconsiderations, a vertical side a and a horizontal side b. The metallicplate 1 may be constructed from such ferrous alloys as cast iron andsteel, and from such alloys of non-ferrous metals as copper, bronze,etc. Openings 2 are made through the thickness of the plate 1 andhorizontally extending. As can be seen in FIG. 1, the openings 2 do notcover the whole width of the plate 1. As a result, the metallic plate 1is S-shaped. In the vertical plane the openings 2 have the form of atrapezium which is to be directed at its smaller base into the furnacechamber. The openings 2 are filled with a refractory material 3.Firebricks, refractory blocks or refractory packing mass may be utilizedas the refractory material 3. Filling said openings may be carried outusing such conventional methods as pouring hot metal on bricks or blocksby laying bricks or blocks, or packing with a refractory mass.

A cooling pipe (in the given example two pipes 4), which follows theconfiguration of the metallic plate 1, is built into said metallic plate1 encompassing the openings 2. The cooling pipes 4 are disposedsubstantially at an equal distance from the edges of the plate 1 or atan equal distance from heat receiving surfaces of the plate 1, therebyproviding for the equalization of the heat front.

As can be seen in FIGS. 1 and 2, the plate 1 is provided with a port 5for passing mounting bolts, and with a mounting clip 6.

Thus, in operation of the cooling plate of the invention there isensured more uniform and intensive heat removal accomplished by acooling liquid circulating within the pipes, thereby increasing theservice life of the cooling plate. It should be noted that in spite of amore intensive cooling of the metallic portion of the plate, the totalheat lost by the cooling plate is decreased 1.4 to 1.5 times which factleads to cutting down the consumption of fuel, e.g. coke in blastfurnaces.

INDUSTRIAL APPLICABILITY

The invention may be used most advantageously for cooling metallurgicalfurnaces.

We claim:
 1. A cooling plate for metallurgical furnaces, comprising ametallic plate provided with openings filled with a refractory material,and a cooling pipe embedded in said metallic plate, wherein theimprovement comprises said openings extending horizontally through thethickness of the plate and the metallic plate having a S-shaped form,said openings having the form of a trapezium in a vertical plane, andthe cooling pipe follows the configuration of said metallic plate.